While the plumbing work is being done, another set of men have been putting in the heating apparatus.

Selection

The selection of the heating apparatus will depend upon local custom, expense and personal preference. Three principal methods present themselves with some special features to recommend each. These are the hot air furnace, the hot water heater, and the steam boiler. The simplest and least expensive in the cost of installation is the hot air furnace (Fig. 57), which also has the merit of introducing a continuous supply of warmed fresh air into the house. Next in cost of installation, is the system of direct steam heating; when once installed the cost of maintenance is less than the hot air furnace. This is due in part to the fact that in direct steam heating, the already tempered air of the rooms is simply raised to the desired warmth, and fresh air must be supplied by other means. This system has the advantage of being more easily adapted to the heating of distant parts of the house, and is positive in its action at all times.

Heating Apparatus 010068Fig. 55. Ground Cock.

Fig. 55. Ground Cock.

Fig. 56. Compression Cock.

Fig. 56. Compression Cock.

Fig. 57. Indirect Draft Furnace.

Fig. 57. Indirect Draft Furnace.

Of greater cost to install, but with some advantages in maintenance, is the system of direct hot water heating. This is similar to direct steam except that hot water circulates throughout the system instead of steam and herein is one advantage due to the ease with which the temperature can be regulated.

Steam is generated by the raising of water to a temperature of 212 degrees F., and so the radiators of a steam heating system are always at about the same temperature, and regulation of the heat is secured by shutting off and turning on the steam at intervals, while with hot water the radiation will be regulated by the temperature of the water which is in circulation all the time. This is a distinct advantage in mild weather as it allows of a smaller fire and a corresponding reduction in the consumption of fuel.

In the selection of a heater the most important thing is to be sure that the heater, whether hot air, hot water or steam, is amply large enough to do the work. Our client has decided to heat his house by means of hot air and we have advised him to put in a furnace which contains a large air chamber in order that the rooms may be supplied with a large quantity of warm air, rather than a smaller quantity of intensely hot air.